阿里云 - 灰度发布/蓝绿发布

蓝绿发布

蓝绿部署是不停老版本，部署新版本然后进行测试，确认OK后将流量逐步切到新版本。蓝绿部署无需停机，并且风险较小。

示例

本例是一个 nginx 应用，包含一个 deployment、 service 以及 ingress。deployment 通过 NodePort 对外暴露端口，并且有一个 ingress 正在对外提供服务。编排模板如下。

示例项目地址：https://code.aliyun.com/CodePipeline/kubernetes-deploy-demo.git

步骤一 部署版本1的应用（old-nginx）

编排模板如下：

 

1. apiVersion: extensions/v1beta1
2. kind: Deployment
3. metadata:
4. name: old-nginx
5. spec:
6. replicas: 2
7. selector:
8. matchLabels:
9. run: old-nginx
10. template:
11. metadata:
12. labels:
13. run: old-nginx
14. spec:
15. containers:
16. - image: registry.cn-hangzhou.aliyuncs.com/xianlu/old-nginx
17. imagePullPolicy: Always
18. name: old-nginx
19. ports:
20. - containerPort: 80
21. protocol: TCP
22. restartPolicy: Always
23. ---
24. apiVersion: v1
25. kind: Service
26. metadata:
27. name: old-nginx
28. spec:
29. ports:
30. - port: 80
31. protocol: TCP
32. targetPort: 80
33. selector:
34. run: old-nginx
35. sessionAffinity: None
36. type: NodePort
38. ---
39. apiVersion: extensions/v1beta1
40. kind: Ingress
41. metadata:
42. name: gray-release
43. spec:
44. rules:
45. - host: www.example.com
46. http:
47. paths:
48. # 老版本服务
49. - path: /
50. backend:
51. serviceName: old-nginx
52. servicePort: 80

配置CodePipeline项目进行部署：

登录Master节点，查询Ingress的访问地址

 

1. # kubectl get ing
2. NAME HOSTS ADDRESS PORTS AGE
3. gray-release www.example.com 47.97.238.11 80 8m

执行curl命令，查看路由的访问情况：

 

1. #curl -H "Host: www.example.com" http://47.97.238.11
2. old

步骤二 创建新版本的应用（new-nginx）

编排模板如下：

 

1. apiVersion: extensions/v1beta1
2. kind: Deployment
3. metadata:
4. name: new-nginx
5. spec:
6. replicas: 1
7. selector:
8. matchLabels:
9. run: new-nginx
10. template:
11. metadata:
12. labels:
13. run: new-nginx
14. spec:
15. containers:
16. - image: registry.cn-hangzhou.aliyuncs.com/xianlu/new-nginx
17. imagePullPolicy: Always
18. name: new-nginx
19. ports:
20. - containerPort: 80
21. protocol: TCP
22. restartPolicy: Always
23. ---
24. apiVersion: v1
25. kind: Service
26. metadata:
27. name: new-nginx
28. spec:
29. ports:
30. - port: 80
31. protocol: TCP
32. targetPort: 80
33. selector:
34. run: new-nginx
35. sessionAffinity: None
36. type: NodePort
37. ---
38. apiVersion: extensions/v1beta1
39. kind: Ingress
40. metadata:
41. name: gray-release
42. annotations:
43. # 请求头中满足正则匹配foo=bar的请求才会被路由到新版本服务new-nginx中
44. #nginx.ingress.kubernetes.io/service-match: |
45. # new-nginx: header("foo", /^bar$/)
46. nginx.ingress.kubernetes.io/service-weight: |
47. new-nginx: ${NEW_PER}, old-nginx: ${OLD_PER}
48. spec:
49. rules:
50. - host: www.example.com
51. http:
52. paths:
53. # 老版本服务
54. - path: /
55. backend:
56. serviceName: old-nginx
57. servicePort: 80
58. # 新版本服务
59. - path: /
60. backend:
61. serviceName: new-nginx
62. servicePort: 80

此处我们在编排模板中设置了${NEW_PER}和${OLD_PER}两个环境变量来帮助调节路由权重。 您可通过灵活调整这两个值来设置蓝绿发布的流量占比。

配置CodePipeline项目进行部署：

设置NEW_PER为0，OLD_PER为100进行部署：

执行curl命令，查看路由的访问情况：

 

1. #curl -H "Host: www.example.com" http://47.97.238.11
2. old
3. #curl -H "Host: www.example.com" http://47.97.238.11
4. old
5. #curl -H "Host: www.example.com" http://47.97.238.11
6. old

设置NEW_PER为50，OLD_PER为50进行部署：

执行curl命令，查看路由的访问情况：

 

1. #curl -H "Host: www.example.com" http://47.97.238.11
2. old
3. #curl -H "Host: www.example.com" http://47.97.238.11
4. old
5. #curl -H "Host: www.example.com" http://47.97.238.11
6. old
7. #curl -H "Host: www.example.com" http://47.97.238.11
8. new
9. #curl -H "Host: www.example.com" http://47.97.238.11
10. new
11. #curl -H "Host: www.example.com" http://47.97.238.11
12. old

设置NEW_PER为100，OLD_PER为0进行部署：

执行curl命令，查看路由的访问情况：

 

1. #curl -H "Host: www.example.com" http://47.97.238.11
2. new
3. #curl -H "Host: www.example.com" http://47.97.238.11
4. new
5. #curl -H "Host: www.example.com" http://47.97.238.11
6. new
7. #curl -H "Host: www.example.com" http://47.97.238.11
8. new

完成新版本应用测试后，您可将 Ingress 的路由权重设置为 100 将流量完全导向新服务；或者删除 Ingress 中的注解和旧版本服务，实现蓝绿发布。

灰度发布

灰度发布是指在黑与白之间，能够平滑过渡的一种发布方式。让一部分用户继续用A，一部分用户开始用B，如果用户对B没有什么反对意见，那么逐步扩大范围，把所有用户都迁移到B上面来。

假若我们希望请求头中满足foo=bar的客户端请求才能路由到新版本服务（new-nginx）中，那么我们可以如下修改配置ingress规则：

编排模板如下：

 

1. apiVersion: extensions/v1beta1
2. kind: Deployment
3. metadata:
4. name: new-nginx
5. spec:
6. replicas: 1
7. selector:
8. matchLabels:
9. run: new-nginx
10. template:
11. metadata:
12. labels:
13. run: new-nginx
14. spec:
15. containers:
16. - image: registry.cn-hangzhou.aliyuncs.com/xianlu/new-nginx
17. imagePullPolicy: Always
18. name: new-nginx
19. ports:
20. - containerPort: 80
21. protocol: TCP
22. restartPolicy: Always
23. ---
24. apiVersion: v1
25. kind: Service
26. metadata:
27. name: new-nginx
28. spec:
29. ports:
30. - port: 80
31. protocol: TCP
32. targetPort: 80
33. selector:
34. run: new-nginx
35. sessionAffinity: None
36. type: NodePort
37. ---
38. apiVersion: extensions/v1beta1
39. kind: Ingress
40. metadata:
41. name: gray-release
42. annotations:
43. # 请求头中满足正则匹配foo=bar的请求才会被路由到新版本服务new-nginx中
44. nginx.ingress.kubernetes.io/service-match: |
45. new-nginx: header("foo", /^bar$/)
46. spec:
47. rules:
48. - host: www.example.com
49. http:
50. paths:
51. # 老版本服务
52. - path: /
53. backend:
54. serviceName: old-nginx
55. servicePort: 80
56. # 新版本服务
57. - path: /
58. backend:
59. serviceName: new-nginx
60. servicePort: 80

配置CodePipeline项目进行部署：

执行curl命令，查看路由的访问情况：

 

1. #curl -H "Host: www.example.com" http://47.97.238.11
2. old
3. #curl -H "Host: www.example.com" http://47.97.238.11
4. old
5. #curl -H "Host: www.example.com" http://47.97.238.11
6. old
7. #curl -H "Host: www.example.com" -H "foo: bar" http://47.97.238.11
8. new
9. #curl -H "Host: www.example.com" -H "foo: bar" http://47.97.238.11
10. new
11. #curl -H "Host: www.example.com" -H "foo: bar" http://47.97.238.11
12. new

来源：https://help.aliyun.com/knowledge_detail/85948.html